Solvedajv NPM: 6.9.0 AJV Commit causing failure to execute node_modules (multiple dependencies affected i.e. ESLint and WebPack Loaders)

What version of Ajv are you using? Does the issue happen if you use the latest version?

Latest version (6.9.0 release I believe)

Ajv options object

      throw new Error('custom keyword definition is invalid: '  + this.errorsText(validateDefinition.errors));

Error: custom keyword definition is invalid: data.errors should be boolean
    at Ajv.addKeyword (/home/mmacheerpuppy/git/fsa/react-application/node_modules/ajv/lib/keyword.js:65:13)
    at module.exports (/home/mmacheerpuppy/git/fsa/react-application/node_modules/ajv-errors/index.js:10:7)
    at Object.<anonymous> (/home/mmacheerpuppy/git/fsa/react-application/node_modules/schema-utils/src/validateOptions.js:22:1)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)

What results did you expect?

Expected to be able to build node_modules but experiencing above stacktrace.

Are you going to resolve the issue?
Current workaround is to remove ESLint dependencies for NPM users, or if using YARN to resolve dependencies to forced version. It's also possible (with the addition of another dependency) to use NPM resolutions (see conversation).


Try using the following packages declaration. npm post install will fail to start. ESLint relies on AJV.

  "name": "food-standards",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "axios": "^0.18.0",
    "bootstrap": "^4.2.1",
    "react": "^16.8.1",
    "react-dom": "^16.8.1",
    "react-scripts": "2.1.3",
    "reactstrap": "^7.1.0"
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  "eslintConfig": {
    "extends": "react-app"
  "browserslist": [
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  "devDependencies": {
    "axios-mock-adapter": "^1.16.0",
    "eslint": "5.6.0",
    "eslint-config-airbnb": "^17.1.0",
    "eslint-plugin-import": "^2.14.0",
    "eslint-plugin-jsx-a11y": "^6.1.1",
    "eslint-plugin-react": "^7.11.0",
    "react-testing-library": "^5.5.3"
33 Answers

โœ”๏ธAccepted Answer


  "resolutions": {
    "ajv": "6.8.1"

to your package.json will create a work around (I am using yarn, don't know if it will work for npm)

Other Answers:

This is certainly related to the latest changes made in the commit history.

released 6.9.1

@velocity-360 I'm trying to write a technical test for a job interview in React! ๐Ÿคฃ

workaround for yarn users:

  "resolutions": {
    "ajv": "6.5.5"

to your package.json and re run yarn install